Fuel Pressure Release: Overview Lexus GS II

Open trunk. Remove luggage compartment floor mat and trim cover. Disconnect fuel pump electrical connector. Start engine and operate until it stalls. Reconnect fuel pump electrical connector. Fuel pressure is now released and fuel system components may be serviced.

Scheme 8

Scheme 9

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-49511-S02594274942001011500000). Disconnect battery cables. Drain cooling system and engine oil. Remove hood.
2. Disconnect control cables at throttle body. Remove air cleaner air duct located above radiator. Remove air cleaner and airflow meter with air cleaner hose attached.
3. Remove drive belt. Remove radiator. Disconnect necessary electrical connections and brackets, coolant hoses, fuel lines and vacuum hoses.
4. Remove power steering pump and A/C compressor with hoses attached and secure aside. Remove heater coolant control valve from firewall. Remove passenger-side kick panel.
5. Remove lower cover from passenger's side of instrument panel. Pull carpet on passenger's side upward to access Engine Control Module (ECM) located on passenger-side floor panel. (Scheme 8) Remove nuts and ECM protector located on top of ECM. Remove ECM retaining nuts.
6. Disconnect electrical connectors from ECM. Remove nuts and pull engine wiring out through firewall. (Scheme 8)
7. Raise and support vehicle. Remove lower engine cover. Disconnect electrical connector for oxygen sensor and sub-oxygen sensor (if equipped) mounted in exhaust pipe. Disconnect exhaust pipe from front catalytic converter.
8. Remove exhaust pipes, rear catalytic converters and mufflers as an assembly. Remove exhaust pipe and front catalytic converter from exhaust manifold. Remove exhaust pipe heat insulator from body. Remove center floor crossmember located below drive shaft.
9. Disconnect electrical connections and control linkages at transmission. Place reference marks on drive shaft companion flange at transmission and rear axle for reassembly reference.
10. Remove companion flange-to-transmission and rear axle companion flange bolts. (Scheme 9) Keep bolts with drive shaft.
11. Remove bolts from center bearing on drive shaft while holding drive shaft in a straight line. Note location of adjusting washers between center bearing and frame (if equipped) for reassembly reference. Pull drive shaft toward front of vehicle until companion flange clears centering pin located in center of flange on rear axle. Remove drive shaft.
12. Support transmission with floor jack. Remove transmission mount-to-transmission crossmember nuts. Note direction for transmission crossmember installation. Transmission crossmember must be installed in original direction.
13. Remove transmission crossmember. Support engine with hoist. Remove engine mount-to-crossmember nuts. Lift engine and transmission from vehicle.